kavemann



UNITED STATES PATENT OFFICE.

F'. KAVEMANN, C. KAVEMANN, AND B. HOERSTMANN, OF CINCINNATI, OHIO,ASSIGNORS TO FREDERICK KAVEMANN AFORESAID.

EXTENSION-LADDER.

Specification of Letters Patent No. 28,039, dated April 24, 1860.

To all whom 'it may concern.'

Be it known that we, FREDERICK KAvE- MANN, CHARLES KAVEMANN, and BANNERTHOERSTMANN, all of Cincinnati, Hamilton county, Ohio, have invented acertain new and useful Improvement in Extension-Lad ders; and we dohereby declare the following to be a full and exact description of thesame, reference being had to the accompanying drawings, making part ofthis specification, in which- Figure 1, is a perspective view of aladder partly extended. Fig. 2 is a perspective View of the jackemployed to extend the ladder.

1, 2, 3, et, 5., are sections adapted to be slid one upon another, whilesecurely held together by clips A.

B are hooks by means of which either section may be held or retained toa more or less extended position.

Stops C limit the extremeascent of the several sections. Hinged to theupper end of section 1 is a brace D held to any desired position by arack E. Each section in the order enumerated is made somewhat narrowerand lighter than its predecessor.

F is a jack by which one section after another may be elevated the clawsf being applied to a round of the section to be raised,.and the jackresting upon the ground.

It will be seen that should only a part of the ladder be wanted one twoor more of the lighter sections can be attached together by drawingbackward out of the clips of the section below. It is also apparent thatthe ladder when extended and leaning against a building may be shiftedin position by persons in or on the building.

The use of a disconnected jack in preference to a windlass permanentlyattached to the ladder or its frame admits of the application of thesame windlass to successive sections of the ladder with great rapidityand ease and affords greater facility for conveying the ladders fromplace to place and using them within contracted area.

We claim as new, and of our invention- The described combination of thedisconnected jack F f, with the sliding and detachable sections 1, 2, 3,4, 5, clips A, hooks B, stops C, brace D, and rack E, the whole beingconstructed and arranged and operated in the manner and for the purposesset forth.

In testimony of which invention, we hereunto set our hands.

F. KAVEMANN. C. KAVEMANN. B. HOERSTMANN.

Vitnesses:

GEO. M. KNIGHT, C. STEEMER, Jr.

